X-ray iron absorption line in Swift J1858.6-0814

Kazumi Asai, Tatehiro Mihara, Kento Sakai, Aya Kubota

研究成果: Article査読

抄録

We present the spectral analysis of bright steady states in an outburst of the transient neutron star low-mass X-ray binary Swift J1858.6-0814 observed with the Neutron star Interior Composition Explorer (NICER). We detected an ionized iron K absorption line (H-like Fe) at 6.97 keV in the spectrum. We estimate the photoionization parameter using the ratio of the equivalent widths of the Fe xxvi (H-like) (17 ± 5 eV) and Fe xxv (He-like) (<3 eV) and discuss the origin of the iron absorption line. The irradiated gas producing the absorption line would locate within (3-6) × 109 cm of the X-ray source. We suggest that the observed H-like Fe absorption line originates from the highly ionized gas in the inner accretion disk in Swift J1858.6-0814.

本文言語English
ページ(範囲)98-102
ページ数5
ジャーナルPublications of the Astronomical Society of Japan
76
1
DOI
出版ステータスPublished - 2024 2月 1

ASJC Scopus subject areas

  • 天文学と天体物理学
  • 宇宙惑星科学

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